1. Spectral observations of active region sources with RATAN-600 and WSRT
- Author
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Alissandrakis, C. E, Gel'frejkh, G. B, Borovik, V. N, Korzhavin, A. N, Bogod, V. M, Nindos, A, and Kundu, M. R
- Subjects
Solar Physics - Abstract
We present spectral observations of neutral line and sunspot associated sources obtained with the RATAN-600 radio telescope and the WSRT in the wavelength range of 2 to 6 cm. Sources associated with large sunspots have flat spectra, while neutral line sources have very steep spectra. In the case of a large spot we estimated the magnetic field to be at least 2700 G at the base of the transition region and 1800 G in the low corona. We consider possible interpretations of the radio emission above the neutral lines. Gyroresonance emission at the fourth harmonic is inadequate, whereas emission from a small population of nonthermal electrons (total number 10 exp 30 to 10 exp 31) with a delta = 3 power law distribution seems to be sufficient.
- Published
- 1993